Final Text

A. The Administrative Process Act and Virginia Register Act
provide that state regulations may incorporate documents by reference. Throughout
these regulations, documents of the types specified below have been
incorporated by reference.

1. United States Code.

2. Code of Virginia.

3. Code of Federal Regulations.

4. Federal Register.

5. Technical and scientific reference documents.

Additional information on key federal regulations and
nonstatutory documents incorporated by reference and their availability may be
found in subsection E of this section.

B. Any reference in these regulations to any provision of the
Code of Federal Regulations (CFR) shall be considered as the adoption by
reference of that provision. The specific version of the provision adopted by
reference shall be that contained in the CFR (2010) in effect July 1, 2010. In
making reference to the Code of Federal Regulations, 40 CFR Part 35 means Part
35 of Title 40 of the Code of Federal Regulations; 40 CFR 35.20 means § 35.20
in Part 35 of Title 40 of the Code of Federal Regulations.

C. Failure to include in this section any document referenced
in the regulations shall not invalidate the applicability of the referenced
document.

D. Copies of materials incorporated by reference in this
section may be examined by the public at the central office of the Department
of Environmental Quality, Eighth Floor, 629 East Main Street, Richmond,
Virginia, between 8:30 a.m. and 4:30 p.m. of each business day.

E. Information on federal regulations and nonstatutory
documents incorporated by reference and their availability may be found below
in this subsection.

1. Code of Federal Regulations.

a. The provisions specified below from the Code of Federal
Regulations (CFR) are incorporated herein by reference.

b. Copies of the document identified in subdivision E 2 a (1)
of this subdivision, and Volume I and Supplements A through C of the document
identified in subdivision E 2 a (2) of this subdivision, may be obtained from:
U.S. Department of Commerce, National Technical Information Service, 5285 Port
Royal Road, Springfield, Virginia 22161; phone 1-800-553-6847. Copies of
Supplements D and E of the document identified in subdivision E 2 a (2) of this
subdivision may be obtained online from EPA's Technology Transfer Network at
http://www.epa.gov/ttn/index.html. Copies of the document identified in
subdivision E 2 a (3) of this subdivision are only available online from EPA's
Technology Transfer Network at http://www.epa.gov/ttn/emc/guidlnd.html.

3. U.S. government.

a. The following document from the U.S. government is
incorporated herein by reference: Standard Industrial Classification Manual,
1987 (U.S. Government Printing Office stock number 041-001-00-314-2).

a. The following document from the ACGIH is incorporated
herein by reference: 1991-1992 Threshold Limit Values for Chemical Substances
and Physical Agents and Biological Exposure Indices (ACGIH Handbook).

b. Copies may be obtained from the American Society of
Mechanical Engineers, Three Park Avenue, New York, New York 10016; phone (800)
843-2763.

9. American Hospital Association (AHA).

a. The following document from the American Hospital Association
is incorporated herein by reference: An Ounce of Prevention: Waste Reduction
Strategies for Health Care Facilities, AHA Catalog no. W5-057007, 1993.

1. The annual ambient air quality standard is 80
micrograms per cubic meter (0.030 parts per million) -- annual arithmetic mean
not to be exceeded in a calendar year. The annual arithmetic mean shall be
rounded to three decimal places (fractional parts equal to or greater than
0.0005 ppm shall be rounded up).

2. The 24-hour ambient air quality standard is 365
micrograms per cubic meter (0.14 parts per million) -- maximum 24-hour
concentration not to be exceeded more than once per calendar year. The 24-hour
averages shall be determined from successive nonoverlapping 24-hour blocks
starting at midnight each calendar day and shall be rounded to two decimal
places (fractional parts equal to or greater than 0.005 ppm shall be rounded
up).

3. The 1-hour annual ambient air quality standard is 75
parts per billion (ppb), measured in the ambient air as sulfur dioxide (SO2).
The 1-hour primary standard is met when the three-year average of the annual
(99th percentile) of the daily maximum 1-hour average concentrations is less
than or equal to 75 ppb, as determined in accordance with Appendix T of 40 CFR
Part 50.

4. The annual and 24-hour ambient air quality standards set
forth in subdivisions 1 and 2 of this subsection shall no longer apply to an
area one year after the effective date of designation of that area pursuant to
§ 107 of the federal Clean Air Act for the 1-hour annual ambient air quality
standard set forth in subdivision 3 of this subsection.

B. The secondary ambient air quality standard is 1,300
micrograms per cubic meter (0.50 parts per million) -- maximum three-hour
concentration not to be exceeded more than once per calendar year. The 3-hour
averages shall be determined from successive nonoverlapping 3-hour blocks
starting at midnight each calendar day and shall be rounded to one decimal
place (fractional parts equal to or greater than 0.05 ppm shall be rounded up).

C. Sulfur dioxide shall be measured by the reference method
described in Appendix AA-1 or A-2 of 40 CFR Part 50, or other
method designated as such, or by an equivalent method.

D. To demonstrate attainment of the annual and 24-hour
primary standardstandards set forth in subdivisions A 1 and 2 of
this section, the annual arithmetic mean and the second-highest 24-hour
averages must be based upon hourly data that are at least 75% complete in each
calendar quarter. A 24-hour block average shall be considered valid if at least
75% of the hourly averages for the 24-hour period are available. In the event
that only 18, 19, 20, 21, 22, or 23 hourly averages are available, the 24-hour
block average shall be computed as the sum of the available hourly averages
using 18, 19, and so on as the divisor. If fewer than 18 hourly averages are
available, but the 24-hour average would exceed the level of the standard when
zeros are substituted for the missing values, subject to the rounding rule of
subdivision A 2 of this section, then this shall be considered a valid 24-hour
average. In this case, the 24-hour block average shall be computed as the sum
of the available hourly averages divided by 24. Data used for demonstrating
attainment of the 1-hour annual primary standard set forth in subdivision A 3
of this section shall meet the requirements of Appendix T of 40 CFR Part 50.

E. To demonstrate attainment of the secondary standard, the
second-highest 3-hour average must be based upon hourly data that are at least
75% complete in each calendar quarter. A 3-hour block average shall be
considered valid only if all three hourly averages for the 3-hour period are
available. If only one or two hourly averages are available, but the 3-hour
average would exceed the level of the standard when zeros are substituted for
the missing values, subject to the rounding rule of subsection B of this
section, then this shall be considered a valid 3-hour average. In all cases,
the 3-hour block average shall be computed as the sum of the hourly averages
divided by three.